Which of the following is a chemical change ?

Melting of magnesium in air

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Burning of magnesium in air

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Dissolution of sugar in water

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Blowing of wind

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Solution

The correct option is A Burning of magnesium in air
Physical change are those which are reversible and in such changes no new product(s) are formed. Chemical changes are those which are irreversible and involves formation of new product(s). Burning of magnesium is chemical change in which magnesium oxide if formed
$2 M g + O_{2} \to 2 M g O$

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